Re: Moon was produced by head-on collision?

From	willner@cfa.harvard.edu (Steve Willner)
Newsgroups	sci.astro, sci.physics
Subject	Re: Moon was produced by head-on collision?
Date	2016-02-03 22:16 +0000
Organization	Harvard-Smithsonian Center for Astrophysics
Message-ID	<n8tu8f$que$1@dont-email.me> (permalink)
References	<dPqdnSyaPpEcxjDLnZ2dnUU7-b3OydjZ@giganews.com> <n8om4s$gp6$1@dont-email.me> <rLOdnXy-3tZHZjLLnZ2dnUU7-fGdnZ2d@giganews.com>

Cross-posted to 2 groups.

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As I wrote earlier, I'm not an expert on this, and a quick web search
didn't turn up anything definitive.  The search did show that the
isotope data have been disputed going back at least as far as 2012.
It's also important to remember that there are other kinds of data
including elemental composition of both bodies.

In article <rLOdnXy-3tZHZjLLnZ2dnUU7-fGdnZ2d@giganews.com>,
 Yousuf Khan <bbbl67@spammenot.yahoo.com> writes:
> Other ones that would still be viable are the Fission hypothesis, where 
> the Moon was once a part of the Earth, but due to an imbalance it 
> pinched itself off of the Earth. This would certainly maintain identical 
> isotope levels between the Earth and Moon.

If the early Earth was spinning fast enough to cause it to fission,
how could it ever have formed in the first place?  For this
hypothesis to be viable, someone would have to produce a real
calculation.

> Another one is the Condensation Hypothesis, which suggested that the 
> Earth and Moon formed from the same section of the original solar system 
> nebula. So basically the two worlds evolved together as a twin planet 
> system. This would also pretty much maintain identical isotope levels.

Also identical element composition, it would seem.  Isn't the Moon
much-depleted in iron?  That's a natural consequence of the impact
hypothesis but seems hard to explain if two bodies formed near each
other.

I don't think the full answer is known yet, but the impact hypothesis
has a lot to like.

-- 
Help keep our newsgroup healthy; please don't feed the trolls.
Steve Willner            Phone 617-495-7123     swillner@cfa.harvard.edu
Cambridge, MA 02138 USA

Thread

Moon was produced by head-on collision? Yousuf Khan <bbbl67@spammenot.yahoo.com> - 2016-01-30 19:55 -0500
  Re: Moon was produced by head-on collision? Sam Wormley <swormley1@gmail.com> - 2016-01-30 22:17 -0600
  Re: Moon was produced by head-on collision? dlzc <dlzc1@cox.net> - 2016-01-31 07:25 -0800
  Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-01-31 09:44 -0800
    Re: Moon was produced by head-on collision? dlzc <dlzc1@cox.net> - 2016-01-31 17:02 -0800
    Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-01-31 23:10 -0800
      Re: Moon was produced by head-on collision? Yousuf Khan <bbbl67@spammenot.yahoo.com> - 2016-02-01 03:13 -0500
        Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-01 10:36 -0800
  Re: Moon was produced by head-on collision? willner@cfa.harvard.edu (Steve Willner) - 2016-02-01 22:27 +0000
    Re: Moon was produced by head-on collision? Yousuf Khan <bbbl67@spammenot.yahoo.com> - 2016-02-01 19:44 -0500
      Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-01 23:12 -0800
        Re: Moon was produced by head-on collision? dlzc <dlzc1@cox.net> - 2016-02-02 05:57 -0800
        Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-02 15:59 -0800
          Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-02 22:14 -0800
            Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-03 14:23 -0800
          Re: Moon was produced by head-on collision? Martin Brown <|||newspam|||@nezumi.demon.co.uk> - 2016-02-04 11:40 +0000
            Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-04 11:35 -0800
              Re: Moon was produced by head-on collision? moroney@world.std.spaamtrap.com (Michael Moroney) - 2016-02-05 03:18 +0000
                Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-04 20:42 -0800
                Re: Moon was produced by head-on collision? Martin Brown <|||newspam|||@nezumi.demon.co.uk> - 2016-02-05 08:46 +0000
                Re: Moon was produced by head-on collision? moroney@world.std.spaamtrap.com (Michael Moroney) - 2016-02-05 15:26 +0000
                Re: Moon was produced by head-on collision? R Kym Horsell <kym@kymhorsell.com> - 2016-02-05 15:39 +0000
                Re: Moon was produced by head-on collision? dlzc <dlzc1@cox.net> - 2016-02-05 12:55 -0800
                Re: Moon was produced by head-on collision? willner@cfa.harvard.edu (Steve Willner) - 2016-02-05 21:48 +0000
                Re: Moon was produced by head-on collision? R Kym Horsell <kym@kymhorsell.com> - 2016-02-05 22:31 +0000
                Re: Moon was produced by head-on collision? Martin Brown <|||newspam|||@nezumi.demon.co.uk> - 2016-02-05 22:50 +0000
                Re: Moon was produced by head-on collision? willner@cfa.harvard.edu (Steve Willner) - 2016-02-11 19:44 +0000
                Re: Moon was produced by head-on collision? Sam Wormley <swormley1@gmail.com> - 2016-02-06 12:41 -0600
                Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-06 01:20 -0800
                Re: Moon was produced by head-on collision? moroney@world.std.spaamtrap.com (Michael Moroney) - 2016-02-06 18:37 +0000
                Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-06 12:53 -0800
                Re: Moon was produced by head-on collision? moroney@world.std.spaamtrap.com (Michael Moroney) - 2016-02-07 01:28 +0000
                Re: Moon was produced by head-on collision? dlzc <dlzc1@cox.net> - 2016-02-07 07:06 -0800
                Re: Moon was produced by head-on collision? moroney@world.std.spaamtrap.com (Michael Moroney) - 2016-02-08 02:58 +0000
                Re: Moon was produced by head-on collision? dlzc <dlzc1@cox.net> - 2016-02-08 06:35 -0800
                Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-07 13:54 -0800
                Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-07 15:11 -0800
                Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-07 16:16 -0800
                Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-08 21:36 -0800
                Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-09 11:37 -0800
            Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-04 12:39 -0800
      Re: Moon was produced by head-on collision? willner@cfa.harvard.edu (Steve Willner) - 2016-02-03 22:16 +0000
        Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-03 22:22 -0800
          Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-03 22:38 -0800
            Re: Moon was produced by head-on collision? The Starmaker <starmaker@ix.netcom.com> - 2016-02-04 11:46 -0800
              Re: Moon was produced by head-on collision? the_shadow <the_shadow@xcoxx.net> - 2016-02-06 07:30 +0000
          Re: Moon was produced by head-on collision? dlzc <dlzc1@cox.net> - 2016-02-04 07:52 -0800

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